Automatic dampeb



T. S. COOPER.

AUTOMATIC DAMPER.

APPLlcAlloN HLED Nov. I3, 1919.

1,370,785. Patented Mar. 8, 1921.

2 SHEETS-SHEET l.

T. S. COOPER.

AUTOMATIC DAMPER. APPLlcAllon FILED Nov.13,1919.

'Vw GMM/wup Patented Mar. 8, 1921.

2 SHEETS-SHEET 2.

Minas/S @0jaar WVM/Leon I UNITED STATES PATENT omen.

rnoMAs s. coor'nn., or ciIAnnnsroN, weer VIRGINIA, As'sIoNoIt ro xoornn nAMInn f co., A conPonAmIon or DELAWARE I 'AUroMATIo DAEIEB.

I Specification of Letters Patent.

Application led November 18, 1919. Serial No. 337,816.

To all/whom t 'may concern:

Be it known that I, THOMAS S. COOPER, a citizen of the United States residing at Charleston, in the county of Kanawha and State of West Virginia, have invented certain new and useful Im rovements in Automatic'Dampers; and I odeclare the follow-v ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 'f

This invention relates generally to dampers, but more particularly to automatic dampers.

One object of the invention is to provide a damper to be placed in a smoke pipe with novel thermostatic means for controlling the position of the damper according to the temperature of the products of combustion passing through the smoke pipe.

Another object of the invention is to pron vide a thermostatically 'operated damper which can be easily applied to smoke pipes' without specially adapting the smoke ipes for the' reception or" the damper, anone which will be of extremely simple construction, efficient and reliable in operation, and well adapted to the purpose for which it is ed. ith these and other objects in view, the invention consists of the novel features of construction, and the combination and arrangement ofyparts as will be hereinafter desi full described and claimed.

T e invention may be carried out i several ways, but in the accompanying raw-v ings the preferred constructions are shown.

n the ddrawings,

Figure lis a horizontal sectional view through a horizontal smoke pipe, showing a thermostatic damper constructed in accordance with this invention disposed therein, the damper being in open position;

Fig. 2 is a verticalsectional view through the smoke Fig., 1;

Fig. 3 is a transverse sectional view taken on the line 8 3 of Fig. 2;

Fig. 4 is a perspective view oi a portion of the shaft on which the damper is" movably. mounted and showing more particularly the shape of the cam Figf is a vertical sectional view through a vertical smoke pipe, showing a slightly dilerenttype of damper mounted therein;

pipe, taken on the line 2- 2 of Fig. 6 is a vertical sectional view taken on the plane indicated by the line 6-6 of Fia. 5; and,

Big'. 7 is a perspective view of a portion of the sleeve which connects adjacent sections ofthe smoke pipe together, and a portion of the shaft upon which the vdamper is mounted. t i

In the drawings above briefly described like parts are indicated by similar reference numerals throu hout the various views, the numeral 1 deslgnating a sleeve which is adapted to be dlsposed within the adjacent ends of a pair of adjacent smoke pipe sec-y `smoke pipe sections A and Band sleeve l is disposed a coiled spring 7 while its other 1 end carries a transversely extending .pin 8 adaptedI tobe held in contact with the sleeve l in the notch 4 by the coiled spring 7 and also a handle 9.

' The shaft 5 is formed at its intermediate -portion at a preferably central point in the smoke pipe with a cam 10'. This cam 10, as shown, is altogether flat on one side while its other side is flat atI its intermediate portion and beveled at its edges as clearly shown in the drawings.

The numeral 11 designates a damper which is of circular shape to conform to the cross sectional configuration of the smoke pipe, and which is provided on a diametrical line with oppositely Iarranged oi'set orv curved strips 12 by which the damper is Patented Mar. s, 1921.,

of the length movably mounted at its intermediate portion upon the shaft 5, said strips 12 being disposed on opposite sides of said shaft. The damper 11 is provided with an elongated opening 13, and disposed adjacent or substantially over this opening is a thermostatic bar 14, the latter being secured at one of its ends by securing elements 15 or in any suitable manner to the damper 11 while its other end bears against the cam 10. ln the the' smok pipe is .connectedis checked and form shown in Figs. 1 to 3 of the drawings the thermostatic bar 14 is composed of strips of dissimilar metals and is normally straight. In this condition it exerts suiiicient pressure against the cam 10 that its free end will bear against the 'flat portion of the cam lrather than one of its beveled edgesgandthus hold the damper 11 in a horizontal and opened position. When in this position as the products of combustion passing through the smoke pipe strike against the damper and the thermostatic bar, the latter will become heated and as the heat reaches a predetermined amount the bar 14vwi1l bow or bend owing to the unequal expansion of the dissimilar metals of which it is composed, This distortion of the bar 14 relieves its pressure upon the cam 1.0 so that the weight of the heavier side of the damper 11 causes the latter to swing into "apartially closed position as indicated by the dotted lines in FigrQ. i As the fire in the fire-box to which the temperature of the products of combustion decreases, the bar v14 will straighten, thereby again exerting pressure upon the cam` lvand passingO up its adjacent inclined edge until it altogether engages the flat portion of this side and consequently moving the damper to opened position.

The smoke pipe shown in Figs. 1 to 3 of the drawings is a horizontal smoke pipe. In Figs. 5 and 6 a vertical smoke pipe is shown and the construction of the various parts o`f the invention is the same as above described 'with' the exception that thethermostat bar 14 is normally bowed or bent, and the am 10 is'disposed a small amount out of right angles with the damper 11 instead of parallel with the same, when said damper stands open, so-that the bar 14 only exerts a slight pressure upon the inclined-edge of the cam under normal conditionsto allow the damper to be disposed in vertical or open position. When the bar 14 becomes heated by the products of combustion passing through the smoke pipefit straightens, thereby increas-` ing its pressure against the cam 10 and. passing from the inclined edge of the latter to the intermediate fiat surface of the same tol move the damper 'into a partially closed position as shown in thedotted lines in Fig. 6. After the bar 14 cools and it again assumes its curved configuration, the damper will swing under its own weight to the vertical position. ,i The shaft 5 is turnably mounted in the openings 3 of the sleeve 1, and the handle 9 isV for the purpose of turning it and adjusting it to any desired position. If the thermostat becomeslchoked by soot or the like so that it will not operate effectively until cleaned, the damper may be operated manually by turning the handle 9.

From the foregoing description, taken in connection with the accompanying draw` ings, the construction, use and operation of the device will be readily understood.

Various changes in form, proportion, and in the minor details of'construction nay be resorted to without departing from the spirit of the invention as defined in the appended claims. y

What is claimed is: j

1. A device v'of the class described comprising a relatively fixed shaft, a damper rockably mounted on said shaft, a thermostatic bar at an angle to the shaft and bendable under changes in temperature, said bar bein secured at one end to said damper at a point remote from said shaft, and means on said shaft coperable with the free end of said thermostatic bar for ,controlling thel polnt remote from said shaft, and a cam on said shaft coperable with the free end of said bar to control the positionof the damper, said cam having a flat side for contact with said bar,when the damper is in lone position and being provided with a beveled edge laterally spaced from theshaft axis and over which said bar rides as the damper moves from one position to another.

3. 'A device of the class described comprisf ing a ring widened in the direction of its axis for reception in the meeting ends of two smoke pipe sections, said ring having an external circumferential rib to abut the pipe.

sections and diametrically alinedopenings extending through said rib, the latter having a notch at the side of one opening, a shaft passingpthrough said opening and having a lateral, projection normally received in said notch to prevent rotation, a damper in said ring rockably mounted on'said shaft,` and .thermostatic means for controlling the rockof said damper on the shaft.

in In testimony whereof I have hereunto set m hand.

y THOMAS S.. COOPER. 

